Technically tubeless tire sealant, but we put it in our tubes for ultimate flat protection. It's basically a biodegradable milk like substance that acts like a self-healing gel. You'll need a tube with a removable valve core. Directions and exact volume required on the bottle, but typically you'll need one bottle per wheel.
When you've used it up, keep the bottle, injector and dip stick. Besides being useful we'll refill it for 10% off with either winter or regular mix!